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<tr class="t-nv"><td colspan="5"> <strong class="selflink">数值极限</strong></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div><div class="t-navbar-head"><strong class="selflink">数值极限</strong><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="limits/FLT_ROUNDS.html" title="c/types/limits/FLT ROUNDS"><span class="t-lines"><span>FLT_ROUNDS</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="limits/FLT_EVAL_METHOD.html" title="c/types/limits/FLT EVAL METHOD"><span class="t-lines"><span>FLT_EVAL_METHOD</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div></div></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div></div>
<h3><span class="mw-headline" id=".E5.BA.93.E7.B1.BB.E5.9E.8B.E6.9E.81.E9.99.90">库类型极限</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>定义于头文件 <code>&lt;stdint.h&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>PTRDIFF_MIN</span></span></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div></div>
</td>
<td>   <span class="t-lc"><a href="ptrdiff_t.html" title="c/types/ptrdiff t">ptrdiff_t</a></span> 类型对象的最小值  <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>PTRDIFF_MAX</span></span></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div></div>
</td>
<td>   <span class="t-lc"><a href="ptrdiff_t.html" title="c/types/ptrdiff t">ptrdiff_t</a></span> 类型对象的最大值  <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>SIZE_MAX</span></span></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div></div>
</td>
<td>   <span class="t-lc"><a href="size_t.html" title="c/types/size t">size_t</a></span> 类型对象的最大值  <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>SIG_ATOMIC_MIN</span></span></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div></div>
</td>
<td>   <span class="t-lc"><a href="../program/sig_atomic_t.html" title="c/program/sig atomic t">sig_atomic_t</a></span> 类型对象的最小值  <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>SIG_ATOMIC_MAX</span></span></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div></div>
</td>
<td>   <span class="t-lc"><a href="../program/sig_atomic_t.html" title="c/program/sig atomic t">sig_atomic_t</a></span> 类型对象的最大值  <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>WINT_MIN</span></span></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div></div>
</td>
<td>   <span class="t-c"><span class="mw-geshi c source-c">wint_t</span></span> 类型对象的最小值  <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>WINT_MAX</span></span></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div></div>
</td>
<td>   <span class="t-c"><span class="mw-geshi c source-c">wint_t</span></span> 类型对象的最大值  <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc-header">
<td colspan="2"> <div>定义于头文件 <code>&lt;wchar.h&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>WCHAR_MIN</span></span></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div></div>
</td>
<td>   <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">wchar_t</span></span></span> 类型对象的最小值  <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>WCHAR_MAX</span></span></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div></div>
</td>
<td>   <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">wchar_t</span></span></span> 类型对象的最大值  <br> <span class="t-mark">(宏常量)</span>
</td></tr>
</table>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">运行此代码</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="co2">#include &lt;stdio.h&gt;</span>
<span class="co2">#include &lt;stdint.h&gt;</span>
<span class="co2">#include &lt;wchar.h&gt;</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"PTRDIFF_MIN    = %td<span class="es1">\n</span>"</span>, PTRDIFF_MIN<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"PTRDIFF_MAX    = %+td<span class="es1">\n</span>"</span>, PTRDIFF_MAX<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"SIZE_MAX       = %zu<span class="es1">\n</span>"</span>, SIZE_MAX<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"SIG_ATOMIC_MIN = %+jd<span class="es1">\n</span>"</span>,<span class="br0">(</span><a href="integer.html"><span class="kw118">intmax_t</span></a><span class="br0">)</span>SIG_ATOMIC_MIN<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"SIG_ATOMIC_MAX = %+jd<span class="es1">\n</span>"</span>,<span class="br0">(</span><a href="integer.html"><span class="kw118">intmax_t</span></a><span class="br0">)</span>SIG_ATOMIC_MAX<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"WCHAR_MIN      = %+jd<span class="es1">\n</span>"</span>,<span class="br0">(</span><a href="integer.html"><span class="kw118">intmax_t</span></a><span class="br0">)</span>WCHAR_MIN<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"WCHAR_MAX      = %+jd<span class="es1">\n</span>"</span>,<span class="br0">(</span><a href="integer.html"><span class="kw118">intmax_t</span></a><span class="br0">)</span>WCHAR_MAX<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"WINT_MIN       = %jd<span class="es1">\n</span>"</span>, <span class="br0">(</span><a href="integer.html"><span class="kw118">intmax_t</span></a><span class="br0">)</span>WINT_MIN<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"WINT_MAX       = %jd<span class="es1">\n</span>"</span>, <span class="br0">(</span><a href="integer.html"><span class="kw118">intmax_t</span></a><span class="br0">)</span>WINT_MAX<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>可能的输出：
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">PTRDIFF_MIN    = -9223372036854775808
PTRDIFF_MAX    = +9223372036854775807
SIZE_MAX       = 18446744073709551615
SIG_ATOMIC_MIN = -2147483648
SIG_ATOMIC_MAX = +2147483647
WCHAR_MIN      = -2147483648
WCHAR_MAX      = +2147483647
WINT_MIN       = 0
WINT_MAX       = 4294967295</pre></div></div> 
</div>
<h3><span class="mw-headline" id=".E6.95.B4.E6.95.B0.E7.B1.BB.E5.9E.8B.E6.9E.81.E9.99.90">整数类型极限</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>定义于头文件 <code>&lt;limits.h&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>CHAR_BIT</span></span></div></div>
</td>
<td>   字节位数  <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>MB_LEN_MAX</span></span></div></div>
</td>
<td>   多字节字符的最大字节数  <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>CHAR_MIN</span></span></div></div>
</td>
<td>   <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">char</span></span></span> 的最小值  <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>CHAR_MAX</span></span></div></div>
</td>
<td>   <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">char</span></span></span> 的最大值  <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>SCHAR_MIN</span><span>SHRT_MIN</span><span>INT_MIN</span><span>LONG_MIN</span><span>LLONG_MIN</span></span></div><div><span class="t-lines"><span></span><span></span><span></span><span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div></div>
</td>
<td>   分别为 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">signed</span> <span class="kw4">char</span></span></span> 、 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">short</span></span></span> 、 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">int</span></span></span> 、 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span></span></span> 和 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">long</span></span></span>的最小值 <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>SCHAR_MAX</span><span>SHRT_MAX</span><span>INT_MAX</span><span>LONG_MAX</span><span>LLONG_MAX</span></span></div><div><span class="t-lines"><span></span><span></span><span></span><span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div></div>
</td>
<td>   分别为 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">signed</span> <span class="kw4">char</span></span></span> 、 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">short</span></span></span> 、 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">int</span></span></span> 、 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span></span></span> 和 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">long</span></span></span>的最大值 <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>UCHAR_MAX</span><span>USHRT_MAX</span><span>UINT_MAX</span><span>ULONG_MAX</span><span>ULLONG_MAX</span></span></div><div><span class="t-lines"><span></span><span></span><span></span><span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div></div>
</td>
<td>   分别为 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">unsigned</span> <span class="kw4">char</span></span></span> 、 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">unsigned</span> <span class="kw4">short</span></span></span> 、 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">unsigned</span> <span class="kw4">int</span></span></span> 、<br><span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">unsigned</span> <span class="kw4">long</span></span></span> 和 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">unsigned</span> <span class="kw4">long</span> <span class="kw4">long</span></span></span> 的最大值 <br> <span class="t-mark">(宏常量)</span>
</td></tr>
</table>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B_2">示例</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">运行此代码</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="co2">#include &lt;stdio.h&gt;</span>
<span class="co2">#include &lt;limits.h&gt;</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>   
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"CHAR_BIT   = %d<span class="es1">\n</span>"</span>, CHAR_BIT<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"MB_LEN_MAX = %d<span class="es1">\n</span>"</span>, MB_LEN_MAX<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"<span class="es1">\n</span>"</span><span class="br0">)</span><span class="sy4">;</span>
 
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"CHAR_MIN   = %+d<span class="es1">\n</span>"</span>, CHAR_MIN<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"CHAR_MAX   = %+d<span class="es1">\n</span>"</span>, CHAR_MAX<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"SCHAR_MIN  = %+d<span class="es1">\n</span>"</span>, SCHAR_MIN<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"SCHAR_MAX  = %+d<span class="es1">\n</span>"</span>, SCHAR_MAX<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"UCHAR_MAX  = %u<span class="es1">\n</span>"</span>,  UCHAR_MAX<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"<span class="es1">\n</span>"</span><span class="br0">)</span><span class="sy4">;</span>
 
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"SHRT_MIN   = %+d<span class="es1">\n</span>"</span>, SHRT_MIN<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"SHRT_MAX   = %+d<span class="es1">\n</span>"</span>, SHRT_MAX<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"USHRT_MAX  = %u<span class="es1">\n</span>"</span>,  USHRT_MAX<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"<span class="es1">\n</span>"</span><span class="br0">)</span><span class="sy4">;</span>
 
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"INT_MIN    = %+d<span class="es1">\n</span>"</span>, INT_MIN<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"INT_MAX    = %+d<span class="es1">\n</span>"</span>, INT_MAX<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"UINT_MAX   = %u<span class="es1">\n</span>"</span>,  UINT_MAX<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"<span class="es1">\n</span>"</span><span class="br0">)</span><span class="sy4">;</span>
 
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"LONG_MIN   = %+ld<span class="es1">\n</span>"</span>, LONG_MIN<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"LONG_MAX   = %+ld<span class="es1">\n</span>"</span>, LONG_MAX<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"ULONG_MAX  = %lu<span class="es1">\n</span>"</span>,  ULONG_MAX<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"<span class="es1">\n</span>"</span><span class="br0">)</span><span class="sy4">;</span>
 
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"LLONG_MIN  = %+lld<span class="es1">\n</span>"</span>, LLONG_MIN<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"LLONG_MAX  = %+lld<span class="es1">\n</span>"</span>, LLONG_MAX<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"ULLONG_MAX = %llu<span class="es1">\n</span>"</span>,  ULLONG_MAX<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"<span class="es1">\n</span>"</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>可能的输出：
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">CHAR_BIT   = 8
MB_LEN_MAX = 16
 
CHAR_MIN   = -128
CHAR_MAX   = +127
SCHAR_MIN  = -128
SCHAR_MAX  = +127
UCHAR_MAX  = 255
 
SHRT_MIN   = -32768
SHRT_MAX   = +32767
USHRT_MAX  = 65535
 
INT_MIN    = -2147483648
INT_MAX    = +2147483647
UINT_MAX   = 4294967295
 
LONG_MIN   = -9223372036854775808
LONG_MAX   = +9223372036854775807
ULONG_MAX  = 18446744073709551615
 
LLONG_MIN  = -9223372036854775808
LLONG_MAX  = +9223372036854775807
ULLONG_MAX = 18446744073709551615</pre></div></div> 
</div>
<h3><span class="mw-headline" id=".E6.B5.AE.E7.82.B9.E7.B1.BB.E5.9E.8B.E6.9E.81.E9.99.90">浮点类型极限</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>定义于头文件 <code>&lt;float.h&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>FLT_RADIX</span></span></div></div>
</td>
<td>   用于表示所有三种浮点数类型的底（整数基） <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>DECIMAL_DIG</span></span></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div></div>
</td>
<td>   将 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">double</span></span></span>转换成十进制小数，再转回 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">double</span></span></span> 而保持同一值，至少需要 <code>DECIMAL_DIG</code> 位小数：此乃 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">double</span></span></span> 序列化/反序列化所需的十进制精度  <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>FLT_DECIMAL_DIG</span><span>DBL_DECIMAL_DIG</span><span>LDBL_DECIMAL_DIG</span></span></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div>
</td>
<td>   将  <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">float</span></span></span>/<span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">double</span></span></span>/<span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">double</span></span></span> 转换成十进制小数再转换回同一值，至少需要 <code>FLT_DECIMAL_DIG</code>/<code>DBL_DECIMAL_DIG</code>/<code>LDBL_DECIMAL_DIG</code> 位小数：此乃浮点值序列化/反序列化所需的十进制精度。标准定义至少为 6 、 10 、 10 ， 而 IEEE float 为 9 ， IEEE double 为 17 。（见 C++ 模仿 <a href="../../cpp/types/numeric_limits/max_digits10.html" title="cpp/types/numeric limits/max digits10">max_digits10</a> ） <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>FLT_MIN</span><span>DBL_MIN</span><span>LDBL_MIN</span></span></div></div>
</td>
<td>   分别为 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">float</span></span></span> 、 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">double</span></span></span> 及 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">double</span></span></span> 的最小正规正值  <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>FLT_TRUE_MIN</span><span>DBL_TRUE_MIN</span><span>LDBL_TRUE_MIN</span></span></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div>
</td>
<td>   分别为 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">float</span></span></span> 、 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">double</span></span></span> 和 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">double</span></span></span> 的最小正值  <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>FLT_MAX</span><span>DBL_MAX</span><span>LDBL_MAX</span></span></div></div>
</td>
<td>   分别为 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">float</span></span></span> 、 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">double</span></span></span> 和 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">double</span></span></span> 的最大有限正值  <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>FLT_EPSILON</span><span>DBL_EPSILON</span><span>LDBL_EPSILON</span></span></div></div>
</td>
<td>   分别为 <span class="t-c"><span class="mw-geshi c source-c"><span class="nu16">1.0</span></span></span> 与下一个可表示的<span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">float</span></span></span> 、 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">double</span></span></span> 和 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">double</span></span></span> 值之差  <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>FLT_DIG</span><span>DBL_DIG</span><span>LDBL_DIG</span></span></div></div>
</td>
<td>   保证能从文本转换为 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">float</span></span></span>/<span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">double</span></span></span>/<span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">double</span></span></span> 再转换回文本，而不会发生改变或上溢出的十进制位数（细节见 C++ 模仿 <a href="../../cpp/types/numeric_limits/digits10.html" title="cpp/types/numeric limits/digits10">digits10</a> ） <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>FLT_MANT_DIG</span><span>DBL_MANT_DIG</span><span>LDBL_MANT_DIG</span></span></div></div>
</td>
<td>   分别为 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">float</span></span></span> 、 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">double</span></span></span> 和 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">double</span></span></span> 所能表示而不损失精度的，浮点尾数中的 <code>FLT_RADIX</code> 底位数  <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>FLT_MIN_EXP</span><span>DBL_MIN_EXP</span><span>LDBL_MIN_EXP</span></span></div></div>
</td>
<td>   分别为对应 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">float</span></span></span> 、 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">double</span></span></span> 和 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">double</span></span></span> 的最小负整数，使得 <code>FLT_RADIX</code> 的该数减一次幂为正规 <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>FLT_MIN_10_EXP</span><span>DBL_MIN_10_EXP</span><span>LDBL_MIN_10_EXP</span></span></div></div>
</td>
<td>   分别为对应 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">float</span></span></span> 、 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">double</span></span></span> 和 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">double</span></span></span> 的最小负整数，使得 <span class="t-c"><span class="mw-geshi c source-c"><span class="nu0">10</span></span></span> 的该数减一次幂为正规的  <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>FLT_MAX_EXP</span><span>DBL_MAX_EXP</span><span>LDBL_MAX_EXP</span></span></div></div>
</td>
<td>   分别为能够使 <code>FLT_RADIX</code> 的该整数减一次幂为可表示的有限的 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">float</span></span></span>、<span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">double</span></span></span> 与 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">double</span></span></span> 的最大正整数 <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>FLT_MAX_10_EXP</span><span>DBL_MAX_10_EXP</span><span>LDBL_MAX_10_EXP</span></span></div></div>
</td>
<td>   分别为能够使 <span class="t-c"><span class="mw-geshi c source-c"><span class="nu0">10</span></span></span> 的该整数减一次幂为可表示的有限的 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">float</span></span></span>、<span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">double</span></span></span> 与 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">double</span></span></span> 的最大正整数  <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="limits/FLT_ROUNDS.html" title="c/types/limits/FLT ROUNDS"> <span class="t-lines"><span>FLT_ROUNDS</span></span></a></div></div>
</td>
<td>   浮点算术的舍入模式，等于 <span class="t-c"><span class="mw-geshi c source-c">float_round_style</span></span>  <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="limits/FLT_EVAL_METHOD.html" title="c/types/limits/FLT EVAL METHOD"> <span class="t-lines"><span>FLT_EVAL_METHOD</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div></div>
</td>
<td>   中间结果所用的扩展精度： 0 表示不使用， 1 表示用 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">double</span></span></span> 替代 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">float</span></span></span> ， 2 表示使用 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">double</span></span></span> <br> <span class="t-mark">(宏常量)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>FLT_HAS_SUBNORM</span><span>DBL_HAS_SUBNORM</span><span>LDBL_HAS_SUBNORM</span></span></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div>
</td>
<td>   类型是否支持非正规（<a href="https://en.wikipedia.org/wiki/Denormal_number" class="extiw" title="enwiki:Denormal number">非正规</a>）数： -1 为不确定， 0 为不支持， 1 为支持  <br> <span class="t-mark">(宏常量)</span>
</td></tr>
</table>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B_3">示例</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">运行此代码</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="co2">#include &lt;stdio.h&gt;</span>
<span class="co2">#include &lt;float.h&gt; </span>
<span class="co2">#include &lt;math.h&gt;</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"FLT_RADIX    = %d<span class="es1">\n</span>"</span>, FLT_RADIX<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"DECIMAL_DIG  = %d<span class="es1">\n</span>"</span>, DECIMAL_DIG<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"FLT_MIN      = %e<span class="es1">\n</span>"</span>, FLT_MIN<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"FLT_MAX      = %e<span class="es1">\n</span>"</span>, FLT_MAX<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"FLT_EPSILON  = %e<span class="es1">\n</span>"</span>, FLT_EPSILON<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"FLT_DIG      = %d<span class="es1">\n</span>"</span>, FLT_DIG<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"FLT_MANT_DIG = %d<span class="es1">\n</span>"</span>, FLT_MANT_DIG<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"FLT_MIN_EXP  = %d<span class="es1">\n</span>"</span>,  FLT_MIN_EXP<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"FLT_MIN_10_EXP  = %d<span class="es1">\n</span>"</span>,  FLT_MIN_10_EXP<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"FLT_MAX_EXP     = %d<span class="es1">\n</span>"</span>,  FLT_MAX_EXP<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"FLT_MAX_10_EXP  = %d<span class="es1">\n</span>"</span>,  FLT_MAX_10_EXP<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"FLT_ROUNDS      = %d<span class="es1">\n</span>"</span>,  <a href="limits/FLT_ROUNDS.html"><span class="kw344">FLT_ROUNDS</span></a><span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"FLT_EVAL_METHOD = %d<span class="es1">\n</span>"</span>,  <a href="http://zh.cppreference.com/w/c/types/limits/FLT_EVAL_METHOD"><span class="kw345">FLT_EVAL_METHOD</span></a><span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw794">printf</span></a><span class="br0">(</span><span class="st0">"FLT_HAS_SUBNORM = %d<span class="es1">\n</span>"</span>,  FLT_HAS_SUBNORM<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>可能的输出：
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">FLT_RADIX    = 2
DECIMAL_DIG  = 37
FLT_MIN      = 1.175494e-38
FLT_MAX      = 3.402823e+38
FLT_EPSILON  = 1.192093e-07
FLT_DIG      = 6
FLT_MANT_DIG = 24
FLT_MIN_EXP  = -125
FLT_MIN_10_EXP  = -37
FLT_MAX_EXP     = 128
FLT_MAX_10_EXP  = 38
FLT_ROUNDS      = 1
FLT_EVAL_METHOD = 1
FLT_HAS_SUBNORM = 1</pre></div></div> 
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
<table class="t-dsc-begin">

</table>

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